POST UTME ACHIEVERS UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a metal has a mass of 50 g and a volume of 20 mL. What is the density of the metal?
A. 2.5 g/mL
B. 2.0 g/mL
C. 1.5 g/mL
D. 1.0 g/mL
Question 2
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in 250 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 3
A non-metal X has a valency of 2. What is the formula of the oxide formed when X reacts with oxygen?
A. X2O
B. X2O2
C. XO
D. XO2
Question 4
The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. NaOH + HCl → NaCl + H2O
B. NaOH + HCl → NaCl + H2O(l)
C. NaOH + HCl → NaCl + H2O(g)
D. NaOH + HCl → NaCl + H2O(l)
Question 5
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in 250 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 6
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 7
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point in a 50 mL solution?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 8
A 0.1 M solution of hydrochloric acid (HCl) is prepared by dissolving 0.1 g of HCl in 100 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 9
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HNO3. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A 5.00-g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. Calculate the molar heat of combustion of the hydrocarbon.
A. -2500 J/mol
B. -25000 J/mol
C. -250000 J/mol
D. -2500000 J/mol
Question 11
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 12
At 273 K, a sample of an ideal gas occupies a volume of 2.5 L. If the pressure is doubled and the temperature is tripled, what is the new volume of the gas?
A. 5.0 L
B. 6.25 L
C. 7.5 L
D. 10.0 L
Question 13
A 2.0 M solution of H2SO4 is diluted to 1.0 M. What is the new volume of the solution?
A. 2 L
B. 4 L
C. 8 L
D. 16 L
Question 14
A metal M has a density of 10 g/cm3. What is the volume of 100 g of M?
A. 10 cm3
B. 20 cm3
C. 30 cm3
D. 40 cm3
Question 15
A 10.0-mL sample of a solution containing 0.500 M glu\cose is diluted to 50.0 mL. Calculate the concentration of the resulting solution.
A. 0.0100 M
B. 0.100 M
C. 0.500 M
D. 1.00 M

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